Shaft-door and stage locking device.



No. 701,809. v Patenfed June 3, I902.

A. GROTHE.

SHAFT DOOR AND STAGE LOCKING DEVICE.

(Application filed Mar. 31, 1902.)

(I9 llddel'.)

UNITED STATES PATENT OFFICE.

AUGUST GROTHE, OF WANNE, GERMANY, ASSIGNOR OF ONE-HALF TO -H. KRAEMER, OF GERMANY.

SHAFT-DOOR AND STAGE LOCKING DEVIC E.

SPECIFICATION forming part of Letters Patent No. 701,809, dated June 3, 1902. Application filed March 31, 1902. Serial No. 100,889. (No model.)

To all whom it may concern.

Be it known that I, AUGUST GROTHE, a subject of the Emperor of Germany, residing at and for locking the stage and allowing the shaft-door to be withdrawn and the objects of my improvements are, first, toprovide a le ver engaging the bolt for locking and unlocking the stage, said lever having a nose or cam second, to provide the pawl actuated by the arriving stage with a projection for engaging said nose or cam when the stage is free tomove, and, third, to provide means for posi-' tively connecting saidbolt-lever with the shaft-door in such a'ma'n'ner that on closing the shaft-door said bolt is withdrawn. to release the stage, while the projection of said pawl on its being released by the moving stage engages said nose or cam of said boltlever, so as to lock the shaft-door, and that,

on the stage arriving and actuating said pawl the projection of the latter releases said nose or cam and allows the shaftdoor to be with{ drawn and the stage to'be bolted up. I attain these objects by the mechanism illustrated in the accompanying drawings, in

Which- Figure l is an elevation of a pit-mouth or a gallery closed with the shaft-door, part of the casing on the right hand being shown in section. Fig. 2 is a similar elevation, the stage being locked and the shaft-door being withdrawn, while parts of the door andofthe right front lining-beam are broken off; and Fig. 3 is a cross-section on'the line A B in Fig. 2 to show the pit-lining beams and the new device. x

Similar letters of reference refer to similar parts throughout the several views.

In the drawings the shaft-door is assumed to be a sliding door f, suspended from the guide-bar g by means of the rollers Z Z. The

right guiding-beam h is provided with a slot m, into which a casing 19 is introduced and where it is secured in any known or approved manner. Inside the casing 13 apawl ais mounted to rock on the pin 1). The pawl ais provided with two slanting faces at n, which project into the shaft when thepawl is left to itself, so that the stage '0 on its arrival may strike against the pawl either when going upward from below or when descending from above and push back the pawl a into the casing 19. At the bottom of the casing 19 a bolt 7; is arranged to move to and fro and to engage a suitable aperture or staple in the stage 0. A shaft is is mounted to turn'in bearings on the casing p and on the one lining-beam r. (See Fig. 3.) On the end of the shaft inside the casing 19 a lever c is aflixed, which engages in a recess qof the bolt 2' and is provided'With a cam or nose 6. This cam or nose is preferably serrated, as shown, or it may be provided with recesses and projections. The pawl a is provided with a proj ection a, which is equallyfserrated or formed otherwise for. engaging with the cam or nose 0, as shown in Fig.1. On the other end of the shaft 70 is affixed a lever d, which is pivotallyconnected with the sliding door f by means of a link (2. When the shaft-doorf is closed, by turning the lever 01 from right to left, Fig. 1, the bolt 11 will be withdrawn by the lever c and allows the-stage to go downward or upward, as the case may be. On the stage 0 releasing the pawl a the latter will fall down, so that its projection a engages the cam or nose '0'. Then the door f will be locked. {When the stage 0 arrives either from below or above, it will strike against the respective slanting face n of the pawl a and push back the latter. Thereby the projection a of the pawl a will be disengaged from the cam or nose 0, so that the shaft-door f can be withdrawn by turning over the lever d in the direction of the arrow in Fig. 1. The door f will then occupy the position s'hownin Fig. 2, while at the same time by the lover a the bolt t'is moved forward to lock the stage 0.

From the above it will be seen that the new device is so arranged that the stage cannot move unless the shaft-door is closed and that during the travel of the stage the shaft-door cannot be opened,as it is automatically locked by the released pawl. For withdrawing the shaft door it is essential that it should be first led automatically released by the stage striking against the pawl.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination with a shaft-door, of a pawl provided with slanting faces, against which the arriving stage strikes to push back the pawl, a bolt, a lever engaging said bolt and provided with a nose, and means for positively connecting said lever with said shaftdoor, so that on opening and closing said shaft-door said bolt is caused to lock and unlock respectively the stage, the said pawl being provided with a projectionfor engaging said nose of said lever to lock said shaft-door, when the pawl is released by the traveling stage substantially as set forth.

2. The combination with a sliding shaftdoor, of a pawl provided with slanting faces,

against which the arriving stage strikes to push back the pawl a bolt, a shaft mounted to turn in suitable bearings, a lever afiixed on said shaft and engaging said bolt and provided with a nose, a lever aflixed on said shaft and pivotally connected with said shaft-door by a link, so that on withdrawing and closing said shaft-door said bolt is caused to lock and unlock respectively the stage, the said pawl being provided with a projection for engaging said nose of said bolt-lever to lock said shaft-door, when the pawl is released by the traveling stage, substantially as set forth.

In witness whereof I have hereunto set my hand in presence of two witnesses.

AUGUST GROTI'IE. \Vitnesses:

WILLIAM ESSENWEIN, PETER LIEBER. 

